反壓狀態是不良的工作狀態，介質中的顆粒、雜質很容易進入密封面，使密封失效。磨軸的主要件為橡膠波紋管，且由于上端密封面處于不良潤滑狀態，動靜環之間的摩擦力矩大于橡膠波紋管與軸之間的傳遞轉矩，從而發生相對轉動。動、靜環輔助密封由于受到污水中的弱酸、弱堿的腐蝕，橡膠件已無彈性。渣漿泵用平遠機械密封的工作原理要求平遠機械密封內部無任何雜質，在組裝平遠機械密封前要徹底清掃動環、靜環、軸套等部件，檢查動靜環表面是否存在劃痕、裂紋等缺陷，這些缺陷存在會造成平遠機械密封嚴重(zhong)漏泄(xie)。必(bi)要時可以制作工裝在組(zu)裝前水(shui)壓(ya)試驗，檢查動(dong)靜環座是(shi)否存在影(ying)響密封(feng)的缺(que)陷(xian)。

　　渣漿平遠泵用平遠機械密封由于密封面變形所引起的，而且平遠機械密封面泄漏的概率是很高的。如果泵在啟動時就發生平遠泵用平遠機械密封泄漏，而拆查密封面時看不見有損壞的地方，這時就應該用平晶檢查平遠機械密封的變(bian)形(xing)情況。如(ru)果發(fa)生變(bian)形(xing)，用平晶檢查密封面(mian)的干涉帶的變(bian)化情況，密封面(mian)變(bian)形(xing)存在于動環和(he)靜環之間。

　　壓缸(gang)體(ti)(ti)(ti)動(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)封(feng)(feng)(feng)(feng)系統采用的是主密(mi)(mi)封(feng)(feng)(feng)(feng)設計(ji)，一(yi)般都(dou)用U型(xing)(xing)密(mi)(mi)封(feng)(feng)(feng)(feng)圈。液壓缸(gang)體(ti)(ti)(ti)的往(wang)復式(shi)動(dong)(dong)(dong)(dong)(dong)態密(mi)(mi)封(feng)(feng)(feng)(feng)系統的設計(ji)，開始使用了(le)更加(jia)復雜的U型(xing)(xing)圈和(he)同軸(zhou)密(mi)(mi)封(feng)(feng)(feng)(feng)組件的復合式(shi)設計(ji)。密(mi)(mi)封(feng)(feng)(feng)(feng)的靜環(huan)通(tong)(tong)常(chang)固定(ding)在(zai)殼(ke)體(ti)(ti)(ti)上，動(dong)(dong)(dong)(dong)(dong)環(huan)通(tong)(tong)過彈(dan)簧(huang)、彈(dan)簧(huang)座與(yu)軸(zhou)一(yi)同旋轉。靜環(huan)與(yu)殼(ke)體(ti)(ti)(ti)、動(dong)(dong)(dong)(dong)(dong)環(huan)與(yu)軸(zhou)形成的間隙用成型(xing)(xing)填料密(mi)(mi)封(feng)(feng)(feng)(feng)。在(zai)動(dong)(dong)(dong)(dong)(dong)環(huan)和(he)靜環(huan)接(jie)觸的端(duan)面(mian)形成相對滑動(dong)(dong)(dong)(dong)(dong)面(mian)，即動(dong)(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)(feng)(feng)面(mian)。為保證密(mi)(mi)封(feng)(feng)(feng)(feng)良好，動(dong)(dong)(dong)(dong)(dong)密(mi)(mi)封(feng)(feng)(feng)(feng)面(mian)應(ying)十分平直(zhi)和(he)光潔。彈(dan)簧(huang)力(li)(li)和(he)被密(mi)(mi)封(feng)(feng)(feng)(feng)的流(liu)體(ti)(ti)(ti)壓力(li)(li)使動(dong)(dong)(dong)(dong)(dong)環(huan)貼(tie)緊靜環(huan)。因動(dong)(dong)(dong)(dong)(dong)環(huan)與(yu)軸(zhou)通(tong)(tong)過彈(dan)簧(huang)連接(jie)，動(dong)(dong)(dong)(dong)(dong)環(huan)和(he)靜環(huan)間貼(tie)合性受(shou)軸(zhou)的振動(dong)(dong)(dong)(dong)(dong)和(he)擺動(dong)(dong)(dong)(dong)(dong)影響較(jiao)小。靜環(huan)一(yi)般常(chang)用潤滑性好的軟質材料如(ru)石墨、填充(chong)聚(ju)四氟(fu)乙烯等，動(dong)(dong)(dong)(dong)(dong)環(huan)多用硬質合金、陶瓷等材料制(zhi)造(zao)。